We will work safely or not at all


What we doSub-surface surveys carried out across the UK

Geophysical surveying enables information of the subsurface to be detected whilst minimising costly and invasive intrusive surveys. With quick deployment and the ability to map large areas without damaging the ground, Geophysics offers an environmentally friendly and targeted approach to site classification.

Geophysical methods identify changes in the physical, chemical or electrical properties of the ground beneath our feet enabling Geophysicists to identify everything from geological formations to landfill extents.


  • Void Mapping
  • UXO identification
  • Locating U/G features
  • Ground Stifness Profiling
  • Bedrock Mapping
  • Soil Resistivity
  • Structural Investigations
  • Pile Surveys
  • Re-bar profiling
  • Crosshole and Downhole Surveys

40SEVEN Advantage

  • UK wide coverage across all environments
  • Highly qualified and experienced staff
  • We utilise a wide range of technology and techniques, including:-

– Ground Probing Radar (GPR) applying multiple antennas and frequencies (100MHz-1.6GHz) to suit the application

– Electromagnetic Conductivity – used to locate culverts and mine shafts

– Magnetometry – used for UXO detection

– Microgravity – used to map sub-surface density changes and presence of cavities

Martyn Utley
Business Development Manager
Contact 40Seven

How we do it40Seven use the most appropriate technology to suit your requirements.

At 40SEVEN we utilise the revolutionary IDS GeoRadar Stream DP Ground Penetrating Radar (GPR) system for surveying large open areas and roads. The main advantages of the Stream DP system are:

  1. High-resolution imaging to identify underground structures, voids, utilities and geological features.
  2. Compact design that can be hand pushed or towed using our Mobile Quad Bike solution.
  3. Onboard GPS technology for accurate realtime positioning.
  4. Dual Polorized antenna system to meet the highest PAS128 M3P and M4P standards.

Electro-Magnetic Conductivity measures the differences in ability of the earth and underground features to conduct electricity. Changes in electrical conductivity enable the identification of material changes in the substructure, such as interfaces between sand, rock and water.

Magnetometry measures the differences in magnetic field taken on by underground features. For example metallic substances such as UXO’s will have a greater ability to take on induced magnetism from the Earth’s magnetic field, which in turn makes them stand out from the surrounding soils and visible to a magnetometer.

Microgravity is used measure changes in gravitational field across a site. This technique is ideal for detecting underground voids and cavities, which can be identified by the survey equipment becuase the void results in a small reduction in gravity as a direct result of the reduced localised mass created by the cavity.


Why choose 40SEVEN?What sets 40SEVEN apart?

We pride ourselves on being able to deliver a high quality product and meeting clients delivery requirements without compromise by focusing on:-

  • Quality – Every project we deliver is subject to our rigorous Quality Control process, which is managed by qualified and accredited professionals.
  • Service – Our clients are allocated a dedicated Project Manager with proven industry experience. We pride ourselves on delivering one stop shop solutions and finding creative answers to the range of challenges projects undoubtedly throw up.
  • Value – By utilizing the very latest technology and experienced surveyors based throughout the country, 40Seven provide cost efficient solutions for all our clients surveying needs.

Explore Our Solutions

Industry-leading surveying services, delivering the right data at the right time.